Technical Drawing History

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Technical Drawing History

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1. Technical Drawing History The artistic cave paintings on the left above (top;French -- bottom; Chinese) communicate familiar surroundings and the excitement of the hunt. Most graphics from earlier periods used simple stick figures, but these became more elaborate over time. Early technical drawings, such as the one represented on the right above were used to communicate general shape information for the construction of a building or other item. At this stage, straight edged instruments were used to produce the drawings and proportions were more accurately portrayed.The artistic cave paintings on the left above (top;French -- bottom; Chinese) communicate familiar surroundings and the excitement of the hunt. Most graphics from earlier periods used simple stick figures, but these became more elaborate over time. Early technical drawings, such as the one represented on the right above were used to communicate general shape information for the construction of a building or other item. At this stage, straight edged instruments were used to produce the drawings and proportions were more accurately portrayed.

2. Perspective drawing technique was invented during the Renaissance period (1300-1500) Perspective drawings provide helpful visualization cues but it is difficult to supply precise size, shape, and detail information.Perspective drawings provide helpful visualization cues but it is difficult to supply precise size, shape, and detail information.

3. Parallel projection technique was invented during the Industrial Revolution period (1750-1850) Monge used parallel projections to permit the accurate representation of 3-D objects on 2-D planes. These principles are used today to display a drawing on a 2-D CAD screen just as they were to show drawings on a 2-D piece of paper. Parallel projection places the observer at a theoretical distance of infinity. This insures that the line-of-sight are parallel and allows engineers to make drawings that are free of perspective.Monge used parallel projections to permit the accurate representation of 3-D objects on 2-D planes. These principles are used today to display a drawing on a 2-D CAD screen just as they were to show drawings on a 2-D piece of paper. Parallel projection places the observer at a theoretical distance of infinity. This insures that the line-of-sight are parallel and allows engineers to make drawings that are free of perspective.

4. 2-D CAD systems were developed in the 1980s Almost everything being produced today has a 2-D representation made for engineering design and production purposes. These drawings contain all of the information necessary to produce or construct something such as a building, road, engine block, or paper clip. The 2-D drawings are a distillation of some two hundred years of practice.Almost everything being produced today has a 2-D representation made for engineering design and production purposes. These drawings contain all of the information necessary to produce or construct something such as a building, road, engine block, or paper clip. The 2-D drawings are a distillation of some two hundred years of practice.

5. 3-D CAD systems were developed in the 1990s Almost everything being produced today has a 2-D representation made for engineering design and production purposes. These drawings contain all of the information necessary to produce or construct something such as a building, road, engine block, or paper clip. The 2-D drawings are a distillation of some two hundred years of practice.Almost everything being produced today has a 2-D representation made for engineering design and production purposes. These drawings contain all of the information necessary to produce or construct something such as a building, road, engine block, or paper clip. The 2-D drawings are a distillation of some two hundred years of practice.

6. Concurrent Engineering is the 21th century star Stress the importance of the database and the fact that it normally comes from the CAD model. Have students list as many stages of a products life as they can -- define a problem, suggest solutions, make models, test models, purchase materials, make production parts, maintain product, dispose of product, etc.Stress the importance of the database and the fact that it normally comes from the CAD model. Have students list as many stages of a products life as they can -- define a problem, suggest solutions, make models, test models, purchase materials, make production parts, maintain product, dispose of product, etc.


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